a little background... was on the pill for a few months. got off the pill at the end of my last cycle. My period started on oct 13th, ended oct 16, and stopped the pill then. I was taking OPK and got an LH surge on Oct 30, which was CD 18. So today is when I am suppose to start my period based on my last cycle, however, since I ovulated 4 days late, I'm thinking my period might be 4 days late. Not sure if that's true. So I was thinking period would come on Nov 13. Today when I went to the bathroom, there was a very tiny line of blood when I wiped. This was hours ago, and have not seen anything since. I will usually be intimate with my husband on the day my period is due to get it to start, which works everytime. Did that today also, and still nothing. does this sound like period is coming, or could it possibly be implantation bleeding? Hope all this info isn't too confusing.